Someone else can probably tell you this better, but team colour (the colours on the shoulder pads/shield etc) is stored in the Alpha channel. If you are working in RGB, there should be four channels to the skin: Red, Green, Blue, and Alpha. If you look on the Alpha channel, there will be a black section where things like the shield and stuff are on the other channels, white out the black bits where the team colour is showing up to remove it.